TeX Quellcode:

\begin{array}{rclll} \dfrac{y^2-5}{2}-\dfrac{2}{y^2}+3 &=& 0 &\vert &\cdot 2y^2\\\\\dfrac{y^2-5}{2}\cdot 2y^2-\dfrac{2}{y^2}\cdot 2y^2+3\cdot 2y^2 &=& 0\\\\\left(y^2-5\right)\cdot y^2-4+6y^2 &=& 0\\y^4-5y^2-4+6y^2 &=& 0\\y^4+y^2-4 &=& 0 \\\left(y^2\right)^2+y^2-4 &=& 0\end{array}